Frequencies for first 10,000 rows of form variable in namcs1998 dataset :

   were any medications |
 from a formulary list? |      Freq.     Percent        Cum.
------------------------+-----------------------------------
                     No |        817        8.17        8.17
                    Yes |      1,566       15.66       23.83
                Unknown |      4,118       41.18       65.01
N/A (no drug mentioned) |      3,499       34.99      100.00
------------------------+-----------------------------------
                  Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 28 Mar 2016